Improved drill



UNITED STATES LOOMIS G. MARSHAL, OF MOKENA, ILLINOIS, ASSIGNOR TOHIMSELF AND PATENT OFFICE.

F. W. HUGHES, OF POTTSVILLE, PENNSYLVANIA.

IMPROVED DRILL.

Specification forming part of Letters Patent No. 48,872, dated July 1S,12565.

To all whom it may concern.

Be it known that I, LooMIs G. MARsHAL, of Mokena,Will county, State ofIllinois, have invented new and useful Improvements in Drillin g-Machines; and I do hereby declare the following to be a clear and exactdescription of the same, reference being had to the accompanyin gdrawings, and to the letters of reference marked thereon, making a partofthis specification.

The nature of my invention consists in the arrangement and combinationof the levers, reel, mode of throwing the reel in and out ot' gear, andthe shape and construction ot the drill.

The object and advantages are speed and accuracy in the operatingdevices and drilling in a perfectly perpendicularline. I

Figure l represents a front elevation of the machine. Fig. 2 representsa side elevation of the machine. Fig. 3 represents the shape andconstruction of the drill, and Fig. 4 the double- Z cutters beneath.

A represents the upright framework 5 B, the driving-wheel at the upperpart ot' the frame,

' whose shaft G extends across the frame and operates two curved levers,D D, and a cog-wheel, E, in the center, the curved levers D operatingupon the ends of the levers Gr G, that are located on a shaft, H, acrossthe frame, so as to be moved up and down to raise and lower the chain I,to which the drillsJ J are suspended, the chain I being coiled around areel, K, so as to be raised and lowered by the reel, when required, thereel having two cog-wheels, LL, at the center to gear into the toothedwheel E to wind or unwind the chain or rope I when a drill is to bedrawn up to be replaced by another; but when the drills are boring, thereel that divides at its center and slides upon its shaftM is ungearedfrom the cog-wheel E by being shifted to each side by the levers N,working on apivot, I?, attached to a cross-bar oftheframe A.

Ihe construction of the drill J is shown at Fig. 3, the top part, Q,being pivot -jointed, and below thejoint are four wings or lianges, R,for the purpose of guiding the drill perpendicularly and prevent itscutting a slanting hole or boring to the side. The lower part of thedrill is divided at S and held by a screw, T, in the center, andpermanently vfastened by akey, V, that is driven into a groove at theside. The lower part or cutters, W,is thus easilyunkeyed and unscrewedat any time, when required to be sharpened or replaced by another. Ithas four lianges or cutters, W, with sharp slanting edges at top .forcutting upward, and grooved on one side and plain on the other, andbeveled below to a chisel-edge, with sharply-beveled ends like a doubleZ, as shown atFig. 4, andthe body of the drill extending down to a pointat the center, so that the dirt and borings Work upward between theilanges W and make the drill operate freer and easier.

What I claim as my invent-ion, and desire to secure by Letters Patent,is

I. The arrangement and combination of the devices D, E, G, J, and Kot'the machine, as herein described, and for the purposes setforth.

2. The arrangement and combination ofthe devices Q, It, T, V, and Wofthe drill J, when constructed and combined as herein described, andfor the purposes set forth.

LOOMIS G. MARSHAL.

Witnesses:

GUY E. FARQUHAR, IvANHoE S. HUBER.

